Grinding head for lens surfacing machines



Dec. '20, 1932. Y H. c) 's1'. DENNIS GRINDING HEAD FOR LENS SURFACING MACHINES VW/ 6 5 Z 2 7 Z .LL. d ..IIL 0 r 1 J M u 3 Z 3 Z l IL L -Dec. 20,1932. H, Q51', DENN|$ 1,891,320.,

GRINDING HEAD FORLENS SURFAGING MACHINES Filed May 1:5, 1932 vs sggetssheet 2 Invenlor n l" In fl Home y Dec. 20, 1932. H, C, ST, DENNgs 1,891,320

GRINDING HEAD FOR LENS SURFACING MACHINES Filed May 15, -1952 5 sheets-sheet 5 llofney Patented Dec. 20, 1932 HAROLD C. ST. DENNIS, OF SYRACU SE, NEW YORK GRINDING- HEAD FOR LENS SURFACING MACHINES Application filedA May 13,

This invention relates to machines for grinding lenses and more particularly to the grinding head of such a machine.

In accordance with the present invention 5 a grinding head is provided which can be readily adjusted to compensate for wear on the moving parts of the machine associated with the head as for example the finger throw shaft, and which also can be adjusted for compensating for wear of the grinding tool and the like. v

The invention together with its numerous objects and advantages will be best understood from a study of the following description, taken in connection with the accompanying drawings wherein:

Figure 1 is an elevational view of the improved head.

Figure 2 is a side edge elevational view of the upper section of the head showing the adapter post section positioned thereon.

Figure 3 is a transverse sectional view through a portion of the head sections and -emery shield associated therewith.

Figure 4 is a top plan view of the head.

Figure 5 is a transverse sectional view therethrough.

Figure 6 is an elevational view of the adjustable section of the adapter.y

Figure 7 is a fragmentary sectional elevational view illustrating the application of the bushing to be hereinafter more fully referred to.

Figure 8 is a view partly in section and partly in elevation of the assembled head.

Figure'9 is aplan view of a shaft'to be hereinafter more fully referred to. l

Figure 10 is a perspective view of the adjustable section forming part of the adapter post, and e Figure 11 is a face view-of a linger supporting plate. Y

Referring more in detail to the drawings it will be seen that my improved head for lens 5 grinding machines comprises a lower half or base section 5 having a substantially flat top lface 6. The upper half of the `head is designated generally by the reference character 7 and is of the same general configuration as the upper portion ofthe lower half section 5, and

1932. Serial No. 611,191.

said upper section 7 has its top and bottom faces flat, and is adapted to rest on the top face 6 of the section 5 as shown.

The contiguous faces of the sections 5 and 6 A are provided with longitudinally extending 5 grooves coinciding to provide an opening '8 extending longitudinally through the head and rotatably accommodating a shaft 9.r `For securing the sections 5 and 7 together with shaft 9 rotatably supported therebetween there are provided set screws 10 engaging said sections 5 and 7 as clearly shown in Figure 3.

An adapter post designated lgenerally by the reference character 11 Vis provided. The l adapter or post 11 is tapered and comprises two half sections, one of which, namely section 12 is integral with the head section 7, and said section 7 is provided with a notch 13 continuing from the base of the post section 12 to one lateral edge of said section 7. The other section, namely section 12a of the adapter post rises from a base 14 having lateral ribs 14al engaging in grooves 13a proe, vvided at relatively opposite sides of the notch 13, and in actual practice the base 14 is adaptedV to be slid inwardly of the notch 1.3 and when the parts 14a and 13a are engaged the post section 12a is secured against displacement in a vertical plane.

To separate the section 12, 12a of the adapter or post 11 there is provided a screw 15 that has an end threadedly engaged in a transverse opening 16 provided in the base section 7, and the inner end of the screw is vadapted to abut a shoulder 17 provided at the inner end of the base 14 by notching said base-as clearly suggested in Figure 5.V

As is thought apparent the adapterV or post 11 is adapted to receive the grinding or other similar tool,y and when the latter is placed on the post 11 the sections thereof may be separated to positively secure the tool on the post by rotating the screw 15 in a clockwise direction whereby the inner end of the screw will` engage against the shoulder 17 and urge the base 14 toward the outer end ofthe notch 13.

A shell like emery shield 18 is also provided, and `thesame lis of substantiallyV the same general configuration as theA upper portion of the head section 5 and head section 17 and said shield 18 comprises a substantially plate like body provided with a depending rim as shown and is adapted to fit over the section 7 and upper portion of the section 5 as shown in Figure 5.

The shield 18 is provided on its top side with a circular opening 19 to accommodate the post or adapter 11, and also Yhas a. circular flange 20 extending about the opening 19. The rim of the shield 18 is of course provided` with a suitable aperture to accommodate the screw 18.

The emery shield 18 is secured in position through the medium of set screws 21 as suggested in Figures 3 and 4.

This invention is also adapted to have used and assembled therewith opposed pairs of lingers designated 'generally by the reference character 22. The fingers 22 are more fully described in a co-pending application filed by me under date of May 30, 1930, Serial No. 457,648.

For each pair of fingers 22 there is provided a. combined supporting and guiding plate 23 which plate is provided with an aperture 24 for accommodating one end of shaft 9, and on one face thereof each plate is also provided with three relatively spaced ribs forming therebetween guide grooves 25 for the lower ends of the fingers 22.

In actual practice the plates 23 are disposed one at each end of shaft 9 and are keyed or otherwise secured to the shaft for rotation therewith. One of the plates 23 is positioned on an end of the shaft 9 between a nut 26 screwed on said end of the shaft and a coil spring 27 arranged on the shaft between said one plate 23 and the proximate end of the head section 5. (See Figure 8).

The other of the plates 23 is arranged on the other end of shaft 9 between a nut 28 screw threadedly engaged with said end of the shaft, and a bushing 29 that is disposed about the shaft 9 and may be welded or otherwise secured thereto. Y

The bushing sleeve 29 at its free end has its lower p ortion extended longitudinally and at the extended end is provided with a flange 30 operating within a notch 31 provided therefor in the proximate side of said section 5 as shown in Figure 8, and it will be noted that the flange 30 operating withinthe notch 31 will limit rotative movement of the shaft 9 in both directions. Y

It will be also noted that the rim of the shield 13 is suitably notched to accommodate spring 27, and that spring 27 will also act to urge the Yshaft 9 toward the right in Figure 8, andbeing at all times under tension will eliminate end play and noise.

In actual practice with the head and associatedparts assembled as illustrated and in a manner apparent, the grinding tool not shown is placed on the adapter or post 11, after which the latter is suitably adjusted to insure a positive retention o-f such tool on the adapter. The fingers 22 will also receive the arms 32 of the lens carrier 33, said lens carrier 33 and arms 32 thereof being suggested by broken lines in Figure 1, and as is well known in the art these fingers will serve to retain the lens carrier 33 against rotative movement, while at the same time by rotating the shaft 9 in the desired direction the angle of the fingers 22 relative to the perpendicular may be easily varied and as may be required by the work. n

It is also apparent that by reason of having the headsections consisting of the two parts 5 and 7 and connected by screws 10, that upon wear in the shaft 9 the screws 10 may be tightened to compensate for wear. Also, the adapter 1l may bel adjusted as found desirable to compensate for variances in the sizes of the grinding tool.

Even though I have herein shown and described the preferred embodiment of the invention, it is to be understood thatthe same is susceptible of further changes, modifications and improvements coming within the scope of the appended claims.

Having thus described my invention, what I claim as new is:

1. In a grinding head for lens surfacing machines, a base section, a top section on said base section, said sections having grooves in contiguous faces thereof providing an opening extending through the head, a shaft journalledin said opening, an adj ustable adapter mounted on said top section, an emery shield covering said top section and provided with an opening through which said adapter extends, oppositely disposed 'ZID-5 pairs of fingers, and means for mounting said fingers on said shaft for rotation therewith.

2. In a grinding head for lens surfacing machines, a base section, a top section on said base section, said sections having grooves in T10 contiguous faces thereof providing an opening extending through the head, a shaft journalled in said opening, an adjustable adapter mounted on said top section, an

emery shield covering saidftop section and U5 provided with an opening through which said adapterYV extends, oppositely disposed pairs of fingers, and means for mounting said fingers on said shaft for rotation therewith,

spring means engaged with said shaft and base and normally urging the shaft in one direction longitudinally of said base.

3. In a grinding headv for lens surfacing machines, a base section, a top section on said` base section, said sections having grooves in contiguous faces thereof providing an opening` extending through the head, a shaft journalled in `said opening, an adjustable adapter mounted on said top section, an emery shield covering said top section .and

provided with an opening through which said adapter extends, oppositely disposed pairs of fingers, and means for mounting said fingers on said shaft for rotation therewith, spring means engaged with said shaft and base and normally urging the shaft in one direction longitudinally of said base, and interengaging means on said shaft and said head section for limiting rotative movement of said shaft.

4. A grinding head for surfacing machines comprising a head member and an adapter post mounted on said head member, said adapter post being tapered and split longitudinally to provide two half sections one of which is integral with said end member and the other of which is shiftable laterally relative to the first named section, and interengaging means on said other half section and on said head member whereby said other half section is constrained to shift laterally relative to the first named half section.

In testimony whereof I aix my signature.

HAROLD C. ST. DENNIS. 

